In an 18-page letter obtained by the Washington Post and published on Friday, Armstrong attorney Robert Luskin replied to USADA’s claims that Armstrong was part of a doping conspiracy by saying USADA had not submitted proper evidence to support its claims of wrongdoing by Armstrong:

“While offensive to any notions of due process and fair play, USADA’s insistence on keeping its evidence a secret from Mr. Armstrong and the Board makes sense in only one respect: The two specific and recycled allegations that it identifies have been thoroughly and publicly discredited.”

The review board is the panel charged with considering evidence submitted by USADA, and those it targets, and judging if there is enough of a case to push forward with formal charges and a hearing on the matter.

Such a case could end up at the Court of Arbitration for Sport and could result in the stripping of Armstrong’s Tour de France titles and a life ban from competition if he is found guilty.

Armstrong has steadfastly denied doping allegations for many years and U.S. Attorney André Birotte Jr. closed a U.S. Justice Department investigation into doping claims without filing charges in February.